Jump to main content
Jump to site search

Issue 7, 2020
Previous Article Next Article

Structural relationships for the design of responsive azobenzene-based lyotropic liquid crystals

Author affiliations

Abstract

Light-responsive binary (azobenzene + solvent) lyotropic liquid crystals (LCs) were investigated by structural modification of simple azobenzene molecules. Three benzoic acid-containing azobenzene molecules 4-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO1), 3-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO2) and 5-(4-(hydroxyphenyl)diazenyl)isophthalic acid (AZO3) were produced with various amide substitutions to produce tectons with a variety of hydrophobicity, size and branching. The LC mesophases formed by binary (azobenzene + solvent) systems with low volatility solvents dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF) as well as the protic ionic liquids ethylammonium formate (EAF) and propylammonium formate (PAF), were investigated using a combination of small-angle X-ray and neutron scattering (SAXS and SANS) as well as polarising light microscopy (PLM). Increasing alkyl group length was found to have a strong influence on LC phase spacing, and changes in the position of substitution on the benzene ring influenced the preferred curvature of phases. UV-induced trans to cis isomerization of the samples was shown to influence ordering and optical birefringence, indicating potential applications in optical devices.

Graphical abstract: Structural relationships for the design of responsive azobenzene-based lyotropic liquid crystals

Back to tab navigation

Supplementary files

Article information


Submitted
06 Oct 2019
Accepted
28 Jan 2020
First published
30 Jan 2020

Phys. Chem. Chem. Phys., 2020,22, 4086-4095
Article type
Paper

Structural relationships for the design of responsive azobenzene-based lyotropic liquid crystals

L. W. Giles, J. B. Marlow, C. S. G. Butler, G. A. Turpin, L. de Campo, S. T. Mudie, C. F. J. Faul and R. F. Tabor, Phys. Chem. Chem. Phys., 2020, 22, 4086
DOI: 10.1039/C9CP05463D

Social activity

Search articles by author

Spotlight

Advertisements